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T0. ALL WHOM IT MAY COGERN:

y held in the lock, and can only vbe removed bythe burglar bybreaking'open the case.-

l'rif'ifr BART-nonoMaw'` or Nnwronk,- N. Y.

ein .dgebulr entre: tt iu time lteitr'a @that ma attingere nf tige sans.

Be it known that I, F. BR'DHOhOMEW, ofthe city, county, and State of'NewYork, have invented anew andimproved Lock fand Ijdo hereby declare thatthe following is a full, clear, and exact description thereof,

lwhich will enable others skilled in the art to make and use thevsame,refrnenee being had Ato the accompanyingv drawings, forming partof this specification.`

The object of this invention is to Aso arrange and construct a lock,that when a pick or a false key is inserted `and turned in the lock Torthe purpose ci .unlocking the same, the said pick or false key will beretained and "The invention consists in the application, to a commonlock, of one or more circular disks, which revolve with the key, one ofwhich disks is prcv'idided with a projecting tooth, which, when awrongkey or pick is used,

v comes in contact with a 'spring that is attached to a sliding plate,and thus the key is preventefkfrom turning the aforesaid disks, so thatthey will comein the right position again to enable the key to bewithdrawn from the lock. In 'the annexed drawings my invention iscompletely illustrated- Figures l1, 2, and 3 the sa1ne.`

. Figure 4 is a horizontal longitudinal section of the lsaine, vtaken onthe line a: zalig. 2. i Figure 5 isa. bottom plan view of the same,partlyin section, taken on the liney 1h-iig. 2.

` Figurei is a vertical cross-section of the same, takenjon the line ze, lig, 2.

:Figure 7 is'aninside or inverted viewof the covering-disk a. i Similarletters of `reference indicate like parts.

A is the ease of the lock, Dis the bolt, C O-areothe tumblcrs, Bis thedrill-pin on which the key ts, and E is a revolving screen, or`curtain,for ring, which turns round with the key, and which is secured to twocircular disks, (z andlnthe front` d isk, a, being slotted to'fiermittlieinsertion of the key, while the inner disk, 6:,

is providedwith alprojecting tooth, e, as shown in the drawings; Abovethe bolt and tumblers, and on the vinner wall A of theea-ising, isarranged a sliding plate, F, which is also provided with a pin or tooth,which is operated by the tooth in lthe disk and which sliding plato isfurther provided with a projecting spring, e, and is held in Ipositionby means of a spring, f, and pins g g, the latter fitting into slotsarranged in the said plate F, and as vshown'iu the d rawing.

The operation is `as follows: In gs. l and vQ ,the lock isshownunlocked.Y In the former g'ure the bolt and tumblers-'are removed. Thekey` G is inserted through the key-hole, and is turned in the directionofthe arrow inigsfl and' 2, earry ing.the plates a and b along with itas 'it revolves. The tumblers are thus raised, and the bolt is 'pushedforward, but the key has to nialie one complete revolution before it canbe removedfrombeing front views of my lock, partly in section, showingthediiierent positions' of.:

the lock again, as otherwise the hole in the plate a will not be underthe Vkey-hole. Just-before this revolution is c ompleted,'the'tcoth c on'the plate strikes against the tooth d on plate F, and moves the latterforward, as indicated by red lines in fig. 1. The spring e istherebybrought close to the disk as also shown by redA lines in fig. 1.The lock is now locked, and the key removed. If,no w, an attempt shouldbe made to unlock ythe lock by means of a. pick 'orl false key, thelatter would be insertedth'rough the key-hole, and would be turned. inthe `direction of the arrow, showny in fig: 13. Before the key reachesthe tuinb1ers,the tooth c will have come in contact with thespring e,and, pressing the same aside, will have passed the same. The false keynot litting thetumblers, and not being able to unlock, the lock is nowturned again in the opposite direction, so that it mayube removed fromthe lock. But'in `this'movement thetooth c comes in contact with the-endof the spring'ie, as shown in iig. 3, and itis made impossible to turnthe keyany further in that direction, while in the otherdirection'thetumblers form an effective barrier against its furtherprogress. As the plate a is only slotted where the key'is inserted, itisevident that as soon as 'the key is turned in the lock, the key-hole isclosed by the said plate, and the burglar not only finds his key firmlyretained in the lock, but also sees every chance of operating the lockdestroyed, as the 'key-hole is effectually closed. From the inside` ofthe door, ii' it should be found desirable, the plate F may be movedback, so as to disengage the tooth c from the spring e. This `is,

done by `means of aknob or handle, It, shown inlred lines in fig. 4,which passes through a slot in the backplate A of the case,'into theplate F; so that the same may thereby be moved back and forth, asdesired. Otherwise, the false key can only be removed from th'e look bytaking v,the latter apart. v

I do not intend to limit the application of my improvement to theparticularform or class of lock or keys herein described, as it isobvious to the skilful lo'oksmitli that various modifications of theseveral parts herein described may be made, at the same time ell'ectingthe object or improvement claimed by me, as, for instance, byattaching-the sliding plates F, springsf, 36e., to others inside of thelock, upon the lock-plate, providing the disk a with the tooth andsecuring it properly, then the disk l could be dispensed with.Di'erentstyles of locks will require other modification of parts.

What I claim as new, and desire to secure by Letters Patent, is'

The combination ot' the revolving toothed disk with the sliding tumblerand spring-catch, all operating as herein shown and described. i

F. H. BARTHOLOMEW.

Witnesses:

WM. F. MeNAMARA, ALEX. F. ROBERTS.

